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                <h1 id="🍳-Web开发实战案例：员工信息-CRUD"><a href="#🍳-Web开发实战案例：员工信息-CRUD" class="headerlink" title="🍳 Web开发实战案例：员工信息 CRUD"></a>🍳 Web开发实战案例：员工信息 CRUD</h1><hr>
<blockquote>
<p>本案例采用 SpringBoot + Thymeleaf，没有使用 Mybatis，全程模拟数据。</p>
<p>只是一个小 Demo，很多功能都没有完善，只实现了最基本的 CRUD 和登录，登录的密码写死了是123456，用户名随意。</p>
<p>由于实际开发中一般不使用 Thymeleaf，所以本篇对于 Thymeleaf 不做过多详细介绍，会用即可。</p>
<p>📂 源码在此：<a target="_blank" rel="noopener" href="https://gitee.com/veal98/springboot_demo">https://gitee.com/veal98/springboot_demo</a></p>
</blockquote>
<p>Thymeleaf 取值语法：</p>
<img src="https://gitee.com/veal98/images/raw/master/img/20200705173227.png" style="zoom:80%;" />

<p>👇 案例的最终效果如下：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200707144408.png"></p>
<p>📄 目录结构如下：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200707144736.png"></p>
<h2 id="1-准备工作"><a href="#1-准备工作" class="headerlink" title="1. 准备工作"></a>1. 准备工作</h2><p>准备工作包括静态资源导入，实体类编写，以及模拟数据库操作</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200705161106.png"></p>
<p><strong>添加依赖</strong>：</p>
<pre class="line-numbers language-xml" data-language="xml"><code class="language-xml"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.springframework.boot<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>spring-boot-starter-web<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.springframework.boot<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>spring-boot-starter-thymeleaf<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p><strong>实体类</strong>：</p>
<ul>
<li><p><code>Department</code> 部门类</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
 * 部门表
 */</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Department</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">private</span> <span class="token class-name">Integer</span> id<span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token class-name">String</span> departmentName<span class="token punctuation">;</span>

    <span class="token keyword">public</span> <span class="token class-name">Department</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token class-name">Department</span><span class="token punctuation">(</span><span class="token class-name">Integer</span> id<span class="token punctuation">,</span> <span class="token class-name">String</span> departmentName<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>id <span class="token operator">=</span> id<span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>departmentName <span class="token operator">=</span> departmentName<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token class-name">Integer</span> <span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> id<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setId</span><span class="token punctuation">(</span><span class="token class-name">Integer</span> id<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>id <span class="token operator">=</span> id<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">getDepartmentName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> departmentName<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setDepartmentName</span><span class="token punctuation">(</span><span class="token class-name">String</span> departmentName<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>departmentName <span class="token operator">=</span> departmentName<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> <span class="token string">"Department&#123;"</span> <span class="token operator">+</span>
                <span class="token string">"id="</span> <span class="token operator">+</span> id <span class="token operator">+</span>
                <span class="token string">", departmentName='"</span> <span class="token operator">+</span> departmentName <span class="token operator">+</span> <span class="token string">'\''</span> <span class="token operator">+</span>
                <span class="token string">'&#125;'</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
<li><p><code>Employee</code> 员工类</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
 * 员工表
 */</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Employee</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">private</span> <span class="token class-name">Integer</span> id<span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token class-name">String</span> lastName<span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token class-name">String</span> email<span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token class-name">Integer</span> gender<span class="token punctuation">;</span> <span class="token comment">// 0 1</span>
    <span class="token keyword">private</span> <span class="token class-name">Department</span> department<span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token class-name">Date</span> birth<span class="token punctuation">;</span>

    <span class="token keyword">public</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token class-name">Integer</span> id<span class="token punctuation">,</span> <span class="token class-name">String</span> lastName<span class="token punctuation">,</span> <span class="token class-name">String</span> email<span class="token punctuation">,</span> <span class="token class-name">Integer</span> gender<span class="token punctuation">,</span> <span class="token class-name">Department</span> department<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>id <span class="token operator">=</span> id<span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>lastName <span class="token operator">=</span> lastName<span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>email <span class="token operator">=</span> email<span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>gender <span class="token operator">=</span> gender<span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>department <span class="token operator">=</span> department<span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>birth <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 偷个懒，以默认的创建日期构造</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token class-name">Integer</span> <span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> id<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setId</span><span class="token punctuation">(</span><span class="token class-name">Integer</span> id<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>id <span class="token operator">=</span> id<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">getLastName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> lastName<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setLastName</span><span class="token punctuation">(</span><span class="token class-name">String</span> lastName<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>lastName <span class="token operator">=</span> lastName<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">getEmail</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> email<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setEmail</span><span class="token punctuation">(</span><span class="token class-name">String</span> email<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>email <span class="token operator">=</span> email<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token class-name">Integer</span> <span class="token function">getGender</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> gender<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setGender</span><span class="token punctuation">(</span><span class="token class-name">Integer</span> gender<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>gender <span class="token operator">=</span> gender<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token class-name">Department</span> <span class="token function">getDepartment</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> department<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setDepartment</span><span class="token punctuation">(</span><span class="token class-name">Department</span> department<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>department <span class="token operator">=</span> department<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token class-name">Date</span> <span class="token function">getBirth</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> birth<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setBirth</span><span class="token punctuation">(</span><span class="token class-name">Date</span> birth<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>birth <span class="token operator">=</span> birth<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> <span class="token string">"Employee&#123;"</span> <span class="token operator">+</span>
                <span class="token string">"id="</span> <span class="token operator">+</span> id <span class="token operator">+</span>
                <span class="token string">", lastName='"</span> <span class="token operator">+</span> lastName <span class="token operator">+</span> <span class="token string">'\''</span> <span class="token operator">+</span>
                <span class="token string">", email='"</span> <span class="token operator">+</span> email <span class="token operator">+</span> <span class="token string">'\''</span> <span class="token operator">+</span>
                <span class="token string">", gender="</span> <span class="token operator">+</span> gender <span class="token operator">+</span>
                <span class="token string">", department="</span> <span class="token operator">+</span> department <span class="token operator">+</span>
                <span class="token string">", birth="</span> <span class="token operator">+</span> birth <span class="token operator">+</span>
                <span class="token string">'&#125;'</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
</ul>
<p><strong>数据库操作类</strong>：</p>
<ul>
<li><p><code>DepartmentDao</code></p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
 * 部门 dao
 */</span>
<span class="token annotation punctuation">@Repository</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">DepartmentDao</span> <span class="token punctuation">&#123;</span>

    <span class="token comment">// 模拟数据库中的数据</span>
    <span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Integer</span><span class="token punctuation">,</span> <span class="token class-name">Department</span><span class="token punctuation">></span></span> departments <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
    <span class="token keyword">static</span><span class="token punctuation">&#123;</span>
        departments <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">HashMap</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 创建一个部门表</span>
        departments<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token number">101</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Department</span><span class="token punctuation">(</span><span class="token number">101</span><span class="token punctuation">,</span> <span class="token string">"教学部"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        departments<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token number">102</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Department</span><span class="token punctuation">(</span><span class="token number">102</span><span class="token punctuation">,</span> <span class="token string">"市场部"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        departments<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token number">103</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Department</span><span class="token punctuation">(</span><span class="token number">103</span><span class="token punctuation">,</span> <span class="token string">"教研部"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        departments<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token number">104</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Department</span><span class="token punctuation">(</span><span class="token number">104</span><span class="token punctuation">,</span> <span class="token string">"运营部"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        departments<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token number">105</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Department</span><span class="token punctuation">(</span><span class="token number">105</span><span class="token punctuation">,</span> <span class="token string">"后勤部"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token punctuation">&#125;</span>

    <span class="token comment">// 获得所有的部门信息</span>
    <span class="token keyword">public</span> <span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Department</span><span class="token punctuation">></span></span> <span class="token function">getDepartment</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> departments<span class="token punctuation">.</span><span class="token function">values</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token comment">// 根据 id 获取部门信息</span>
    <span class="token keyword">public</span> <span class="token class-name">Department</span> <span class="token function">getDepartmentById</span><span class="token punctuation">(</span><span class="token class-name">Integer</span> id<span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> departments<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
<li><p><code>EmployeeDao</code></p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
 * 员工 Dao
 */</span>
<span class="token annotation punctuation">@Repository</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">EmployeeDao</span> <span class="token punctuation">&#123;</span>

    <span class="token comment">// 模拟数据库中的数据</span>
    <span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Integer</span><span class="token punctuation">,</span> <span class="token class-name">Employee</span><span class="token punctuation">></span></span> employees <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
    <span class="token comment">// 员工有所属的部门</span>
    <span class="token annotation punctuation">@Autowired</span>
    <span class="token keyword">private</span> <span class="token class-name">DepartmentDao</span> departmentDao<span class="token punctuation">;</span>
    <span class="token keyword">static</span><span class="token punctuation">&#123;</span>
        employees <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">HashMap</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 创建一个员工表</span>
        employees<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token number">101</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token number">1001</span><span class="token punctuation">,</span> <span class="token string">"AA"</span><span class="token punctuation">,</span> <span class="token string">"123456@qq.com"</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Department</span><span class="token punctuation">(</span><span class="token number">101</span><span class="token punctuation">,</span><span class="token string">"教学部"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        employees<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token number">102</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token number">1002</span><span class="token punctuation">,</span> <span class="token string">"BB"</span><span class="token punctuation">,</span> <span class="token string">"1546556@qq.com"</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Department</span><span class="token punctuation">(</span><span class="token number">102</span><span class="token punctuation">,</span> <span class="token string">"市场部"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        employees<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token number">103</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token number">1003</span><span class="token punctuation">,</span> <span class="token string">"CC"</span><span class="token punctuation">,</span> <span class="token string">"765543@qq.com"</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Department</span><span class="token punctuation">(</span><span class="token number">103</span><span class="token punctuation">,</span> <span class="token string">"教研部"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        employees<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token number">104</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token number">1004</span><span class="token punctuation">,</span> <span class="token string">"DD"</span><span class="token punctuation">,</span> <span class="token string">"34654234@qq.com"</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Department</span><span class="token punctuation">(</span><span class="token number">104</span><span class="token punctuation">,</span> <span class="token string">"运营部"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        employees<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token number">105</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token number">1005</span><span class="token punctuation">,</span> <span class="token string">"EE"</span><span class="token punctuation">,</span> <span class="token string">"72423423456@qq.com"</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Department</span><span class="token punctuation">(</span><span class="token number">105</span><span class="token punctuation">,</span> <span class="token string">"后勤部"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token comment">// 增加一个员工（主键自增）</span>
    <span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token class-name">Integer</span> initId <span class="token operator">=</span> <span class="token number">1006</span><span class="token punctuation">;</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">save</span><span class="token punctuation">(</span><span class="token class-name">Employee</span> employee<span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>employee<span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token comment">// 设置Id</span>
            employee<span class="token punctuation">.</span><span class="token function">setId</span><span class="token punctuation">(</span>initId <span class="token operator">++</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        employee<span class="token punctuation">.</span><span class="token function">setDepartment</span><span class="token punctuation">(</span>departmentDao<span class="token punctuation">.</span><span class="token function">getDepartmentById</span><span class="token punctuation">(</span>employee<span class="token punctuation">.</span><span class="token function">getDepartment</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 设置部门</span>
        employees<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>employee<span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>employee<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 放入 Map (数据库)</span>
    <span class="token punctuation">&#125;</span>

    <span class="token comment">// 查询全部员工信息</span>
    <span class="token keyword">public</span> <span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Employee</span><span class="token punctuation">></span></span> <span class="token function">getAll</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> employees<span class="token punctuation">.</span><span class="token function">values</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token comment">// 根据 id 查询员工信息</span>
    <span class="token keyword">public</span> <span class="token class-name">Employee</span> <span class="token function">getEmployeeById</span><span class="token punctuation">(</span><span class="token class-name">Integer</span> id<span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> employees<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token comment">// 根据 id 删除员工</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">delete</span><span class="token punctuation">(</span><span class="token class-name">Integer</span> id<span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        employees<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

<span class="token punctuation">&#125;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
</ul>
<p>Thymeleaf 中链接使用标签 <code>@&#123;...&#125;</code>，使用 <code>th:href = &quot;@&#123;...&#125;&quot;</code> 导入资源路径，例如：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>link</span> <span class="token attr-name"><span class="token namespace">th:</span>href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>@&#123;/css/bootstrap.min.css&#125;<span class="token punctuation">"</span></span> <span class="token attr-name">rel</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>stylesheet<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<h2 id="2-默认访问首页"><a href="#2-默认访问首页" class="headerlink" title="2. 默认访问首页"></a>2. 默认访问首页</h2><p>当访问  <code>http://localhost:8080/</code> 的时候，默认去找静态资源文件夹下的 <code>index.html</code>，此处我们想要默认加载 <code>templates </code>文件夹（在此文件夹中的资源才能被 Thymeleaf  解析）下的 <code>index.html</code>  作为首页。</p>
<p>扩展 SpringMVC 配置：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Configuration</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">MyMvcConfig</span> <span class="token keyword">implements</span> <span class="token class-name">WebMvcConfigurer</span> <span class="token punctuation">&#123;</span>

    <span class="token comment">// 添加视图映射</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addViewControllers</span><span class="token punctuation">(</span><span class="token class-name">ViewControllerRegistry</span> registry<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        registry<span class="token punctuation">.</span><span class="token function">addViewController</span><span class="token punctuation">(</span><span class="token string">"/"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">setViewName</span><span class="token punctuation">(</span><span class="token string">"index"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        registry<span class="token punctuation">.</span><span class="token function">addViewController</span><span class="token punctuation">(</span><span class="token string">"/index.html"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">setViewName</span><span class="token punctuation">(</span><span class="token string">"index"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="3-国际化"><a href="#3-国际化" class="headerlink" title="3. 国际化"></a>3. 国际化</h2><h3 id="①-创建国际化配置文件"><a href="#①-创建国际化配置文件" class="headerlink" title="① 创建国际化配置文件"></a>① 创建国际化配置文件</h3><p>在 resources 文件夹下创建 i18n 文件夹，以及<code>login.properties</code> 和 <code>login_zh_CN.properties</code></p>
<p>创建完毕后，两个文件会自动合并成一个文件夹：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200705165012.png"></p>
<p>右键可直接添加配置文件</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200705165036.png"></p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200705165220.png"></p>
<h3 id="②-编写国际化配置文件"><a href="#②-编写国际化配置文件" class="headerlink" title="② 编写国际化配置文件"></a>② 编写国际化配置文件</h3><p>可点击 <code>Resource Bundle</code> 进行可视化配置：</p>
<img src="https://gitee.com/veal98/images/raw/master/img/20200705165321.png" style="zoom:80%;" />

<p>添加如下配置：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200705165925.png"></p>
<p>同时在全局配置文件中添加如下配置：</p>
<pre class="line-numbers language-properties" data-language="properties"><code class="language-properties"><span class="token comment"># 国际化配置文件的真实路径</span>
<span class="token attr-name">spring.messages.basename</span> <span class="token punctuation">=</span> <span class="token attr-value">i18n.login</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>

<p>Thymeleaf 中，使用标签<code>#&#123;...&#125;</code> 来获取配置文件中的信息，例如：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>sr-only<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">th:</span>text</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>#&#123;login.username&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>Username<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<h3 id="③-实现点击链接切换语言"><a href="#③-实现点击链接切换语言" class="headerlink" title="③ 实现点击链接切换语言"></a>③ 实现点击链接切换语言</h3><p>给 url 地址添加参数 <code>language</code>，国际化解析器对参数进行解析：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>btn btn-sm<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">th:</span>href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>@&#123;/index.html(language=<span class="token punctuation">'</span>zh_CN<span class="token punctuation">'</span>)&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>中文<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>btn btn-sm<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">th:</span>href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>@&#123;/index.html(language=<span class="token punctuation">'</span>en_US<span class="token punctuation">'</span>)&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>English<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>

<p>自定义的一个简单的国际化解析器： <code>config.MyLocaleResolver.java</code></p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">package</span> <span class="token namespace">com<span class="token punctuation">.</span>smallbeef<span class="token punctuation">.</span>springboot_demo<span class="token punctuation">.</span>config</span><span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span><span class="token class-name">StringUtils</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>web<span class="token punctuation">.</span>servlet<span class="token punctuation">.</span></span><span class="token class-name">LocaleResolver</span><span class="token punctuation">;</span>

<span class="token keyword">import</span> <span class="token namespace">javax<span class="token punctuation">.</span>servlet<span class="token punctuation">.</span>http<span class="token punctuation">.</span></span><span class="token class-name">HttpServletRequest</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">javax<span class="token punctuation">.</span>servlet<span class="token punctuation">.</span>http<span class="token punctuation">.</span></span><span class="token class-name">HttpServletResponse</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span><span class="token class-name">Locale</span><span class="token punctuation">;</span>

<span class="token comment">/**
 * 国际化解析器
 */</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">MyLocaleResolver</span> <span class="token keyword">implements</span> <span class="token class-name">LocaleResolver</span> <span class="token punctuation">&#123;</span>

    <span class="token comment">// 解析请求</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token class-name">Locale</span> <span class="token function">resolveLocale</span><span class="token punctuation">(</span><span class="token class-name">HttpServletRequest</span> httpServletRequest<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token comment">// 获取请求url中的参数</span>
        <span class="token class-name">String</span> language <span class="token operator">=</span> httpServletRequest<span class="token punctuation">.</span><span class="token function">getParameter</span><span class="token punctuation">(</span><span class="token string">"language"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">Locale</span> locale <span class="token operator">=</span>  <span class="token class-name">Locale</span><span class="token punctuation">.</span><span class="token function">getDefault</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 如果没有就使用默认的</span>
        <span class="token comment">// 如果请求携带了国际化的参数</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token operator">!</span><span class="token class-name">StringUtils</span><span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span>language<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
            <span class="token comment">// zh_CN</span>
            <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> split <span class="token operator">=</span> language<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">"_"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">// 国家，地区</span>
            locale <span class="token operator">=</span>  <span class="token keyword">new</span> <span class="token class-name">Locale</span><span class="token punctuation">(</span>split<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">,</span> split<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token keyword">return</span> locale<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setLocale</span><span class="token punctuation">(</span><span class="token class-name">HttpServletRequest</span> httpServletRequest<span class="token punctuation">,</span> <span class="token class-name">HttpServletResponse</span> httpServletResponse<span class="token punctuation">,</span> <span class="token class-name">Locale</span> locale<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>

    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>参考<code>LocaleResolver </code>类（获取区域信息对象）的源码如下：</p>
<img src="https://gitee.com/veal98/images/raw/master/img/20200705171737.png" style="zoom:80%;" />

<p>将我们自己写的国际化组件配置到 Spring 的容器中（<code>@Bean</code>），即注册国际化组件：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Configuration</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">MyMvcConfig</span> <span class="token keyword">implements</span> <span class="token class-name">WebMvcConfigurer</span> <span class="token punctuation">&#123;</span>

    <span class="token comment">// 添加视图映射</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addViewControllers</span><span class="token punctuation">(</span><span class="token class-name">ViewControllerRegistry</span> registry<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        registry<span class="token punctuation">.</span><span class="token function">addViewController</span><span class="token punctuation">(</span><span class="token string">"/"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">setViewName</span><span class="token punctuation">(</span><span class="token string">"index"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        registry<span class="token punctuation">.</span><span class="token function">addViewController</span><span class="token punctuation">(</span><span class="token string">"/index.html"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">setViewName</span><span class="token punctuation">(</span><span class="token string">"index"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token comment">// 自定义的国际化组件生效</span>
    <span class="token annotation punctuation">@Bean</span>
    <span class="token keyword">public</span> <span class="token class-name">LocaleResolver</span> <span class="token function">localeResolver</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">MyLocaleResolver</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>效果如下：</p>
<img src="https://gitee.com/veal98/images/raw/master/img/20200705173441.gif" style="zoom: 67%;" />

<h2 id="4-登陆"><a href="#4-登陆" class="headerlink" title="4. 登陆"></a>4. 登陆</h2><h3 id="①-禁用模板引擎的缓存"><a href="#①-禁用模板引擎的缓存" class="headerlink" title="① 禁用模板引擎的缓存"></a>① 禁用模板引擎的缓存</h3><p>在全局配置文件中禁用模板引擎的缓存，使得开发期间模板引擎页面修改以后实时生效</p>
<pre class="line-numbers language-properties" data-language="properties"><code class="language-properties"><span class="token comment"># 禁用缓存</span>
<span class="token attr-name">spring.thymeleaf.cache</span><span class="token punctuation">=</span><span class="token attr-value">false </span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>

<h3 id="②-信息校验"><a href="#②-信息校验" class="headerlink" title="② 信息校验"></a>② 信息校验</h3><p>登录界面的部分前端代码：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text-center<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>form</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-signin<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">th:</span>action</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>@&#123;/user/login&#125;<span class="token punctuation">"</span></span> <span class="token attr-name">method</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>post<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        .....
        <span class="token comment">&lt;!--错误提示信息--></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span> <span class="token special-attr"><span class="token attr-name">style</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token value css language-css"><span class="token property">color</span><span class="token punctuation">:</span> red</span><span class="token punctuation">"</span></span></span> <span class="token attr-name"><span class="token namespace">th:</span>text</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;msg&#125;<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">th:</span>if</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;not #strings.isEmpty(msg)&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">></span></span>
        
        .....
        
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span>  <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>username<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-control<span class="token punctuation">"</span></span> <span class="token attr-name">placeholder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Username<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">th:</span>placeholder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>#&#123;login.username&#125;<span class="token punctuation">"</span></span> <span class="token attr-name">required</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token punctuation">"</span></span> <span class="token attr-name">autofocus</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        
        ......
        
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-control<span class="token punctuation">"</span></span> <span class="token attr-name">placeholder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Password<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">th:</span>placeholder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>#&#123;login.password&#125;<span class="token punctuation">"</span></span> <span class="token attr-name">required</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        ......
        
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>form</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>控制器 <code>LoginController</code>：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Controller</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">LoginController</span> <span class="token punctuation">&#123;</span>

    <span class="token annotation punctuation">@RequestMapping</span><span class="token punctuation">(</span><span class="token string">"/user/login"</span><span class="token punctuation">)</span>
    <span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">login</span><span class="token punctuation">(</span>
            <span class="token annotation punctuation">@RequestParam</span><span class="token punctuation">(</span><span class="token string">"username"</span><span class="token punctuation">)</span> <span class="token class-name">String</span> username<span class="token punctuation">,</span>
            <span class="token annotation punctuation">@RequestParam</span><span class="token punctuation">(</span><span class="token string">"password"</span><span class="token punctuation">)</span> <span class="token class-name">String</span> password<span class="token punctuation">,</span>
            <span class="token class-name">Model</span> model<span class="token punctuation">,</span> <span class="token class-name">HttpSession</span> session<span class="token punctuation">)</span><span class="token punctuation">&#123;</span>

        <span class="token comment">// 简单的登录验证</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token operator">!</span><span class="token class-name">StringUtils</span><span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span>username<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> <span class="token string">"12345"</span><span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>password<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
            session<span class="token punctuation">.</span><span class="token function">setAttribute</span><span class="token punctuation">(</span><span class="token string">"loginUser"</span><span class="token punctuation">,</span> username<span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">// 用户信息存入 session</span>
            <span class="token keyword">return</span> <span class="token string">"redirect:/main.html"</span><span class="token punctuation">;</span> 
        <span class="token punctuation">&#125;</span>
        <span class="token keyword">else</span><span class="token punctuation">&#123;</span>
            <span class="token comment">// 显示登录失败信息</span>
            model<span class="token punctuation">.</span><span class="token function">addAttribute</span><span class="token punctuation">(</span><span class="token string">"msg"</span><span class="token punctuation">,</span><span class="token string">"用户名或者密码错误！"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">return</span> <span class="token string">"index"</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p><code>dashboard.html</code> 是我们的后台界面，将其映射到 <code>main.html</code> 路径</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">registry<span class="token punctuation">.</span><span class="token function">addViewController</span><span class="token punctuation">(</span><span class="token string">"/main.html"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">setViewName</span><span class="token punctuation">(</span><span class="token string">"dashboard"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<p>效果如下：</p>
<img src="https://gitee.com/veal98/images/raw/master/img/20200705200333.png" style="zoom: 67%;" />





<h2 id="5-拦截器进行登陆检查"><a href="#5-拦截器进行登陆检查" class="headerlink" title="5. 拦截器进行登陆检查"></a>5. 拦截器进行登陆检查</h2><p>现在如果我们直接输入 <code>http://localhost:8080/main.html</code> 可以跳过登录直接访问，显然这是不合理的。此时需要拦截器进行登录检查 </p>
<h3 id="①-拦截器"><a href="#①-拦截器" class="headerlink" title="① 拦截器"></a>① 拦截器</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">LoginHandlerIntercepter</span> <span class="token keyword">implements</span> <span class="token class-name">HandlerInterceptor</span> <span class="token punctuation">&#123;</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">preHandle</span><span class="token punctuation">(</span><span class="token class-name">HttpServletRequest</span> request<span class="token punctuation">,</span> <span class="token class-name">HttpServletResponse</span> response<span class="token punctuation">,</span> <span class="token class-name">Object</span> handler<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Exception</span> <span class="token punctuation">&#123;</span>

        <span class="token comment">// 登录成功后 ，应该有用户的 session</span>
        <span class="token class-name">Object</span> loginUser <span class="token operator">=</span> request<span class="token punctuation">.</span><span class="token function">getSession</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getAttribute</span><span class="token punctuation">(</span><span class="token string">"loginUser"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token keyword">if</span><span class="token punctuation">(</span>loginUser <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span> <span class="token comment">// 未登录</span>
            request<span class="token punctuation">.</span><span class="token function">setAttribute</span><span class="token punctuation">(</span><span class="token string">"msg"</span><span class="token punctuation">,</span> <span class="token string">"没有权限，请先登录"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            request<span class="token punctuation">.</span><span class="token function">getRequestDispatcher</span><span class="token punctuation">(</span><span class="token string">"/index.html"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forward</span><span class="token punctuation">(</span>request<span class="token punctuation">,</span>response<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span> <span class="token comment">// 表示拦截</span>
        <span class="token punctuation">&#125;</span>
        <span class="token keyword">else</span>
            <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span> <span class="token comment">// 表示放行</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="②-注册拦截器"><a href="#②-注册拦截器" class="headerlink" title="② 注册拦截器"></a>② 注册拦截器</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Configuration</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">MyMvcConfig</span> <span class="token keyword">implements</span> <span class="token class-name">WebMvcConfigurer</span> <span class="token punctuation">&#123;</span>

    <span class="token comment">// 添加视图映射</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addViewControllers</span><span class="token punctuation">(</span><span class="token class-name">ViewControllerRegistry</span> registry<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        registry<span class="token punctuation">.</span><span class="token function">addViewController</span><span class="token punctuation">(</span><span class="token string">"/"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">setViewName</span><span class="token punctuation">(</span><span class="token string">"index"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        registry<span class="token punctuation">.</span><span class="token function">addViewController</span><span class="token punctuation">(</span><span class="token string">"/index.html"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">setViewName</span><span class="token punctuation">(</span><span class="token string">"index"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        registry<span class="token punctuation">.</span><span class="token function">addViewController</span><span class="token punctuation">(</span><span class="token string">"/main.html"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">setViewName</span><span class="token punctuation">(</span><span class="token string">"dashboard"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token comment">// 自定义的国际化组件生效</span>
    <span class="token annotation punctuation">@Bean</span>
    <span class="token keyword">public</span> <span class="token class-name">LocaleResolver</span> <span class="token function">localeResolver</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">MyLocaleResolver</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token comment">// 注册拦截器</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addInterceptors</span><span class="token punctuation">(</span><span class="token class-name">InterceptorRegistry</span> registry<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        registry<span class="token punctuation">.</span><span class="token function">addInterceptor</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">LoginHandlerIntercepter</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">addPathPatterns</span><span class="token punctuation">(</span><span class="token string">"/**"</span><span class="token punctuation">)</span>
                <span class="token punctuation">.</span><span class="token function">excludePathPatterns</span><span class="token punctuation">(</span><span class="token string">"/index.html"</span><span class="token punctuation">,</span><span class="token string">"/"</span><span class="token punctuation">,</span><span class="token string">"/user/login"</span><span class="token punctuation">,</span> <span class="token string">"/css/**"</span><span class="token punctuation">,</span><span class="token string">"/js/**"</span><span class="token punctuation">,</span><span class="token string">"/img/**"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>效果如下，如果我们未经登录直接访问 <code>main.html</code> 的话：</p>
<img src="https://gitee.com/veal98/images/raw/master/img/20200705202134.png" style="zoom:67%;" />

<h3 id="③-回显用户名"><a href="#③-回显用户名" class="headerlink" title="③ 回显用户名"></a>③ 回显用户名</h3><p>在后台管理界面实现用户名回显：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200705204017.png"></p>
<p>在前端界面从 session 中取出数据就行了：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>navbar-brand col-sm-3 col-md-2 mr-0<span class="token punctuation">"</span></span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>#<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>[[$&#123;session.loginUser&#125;]]<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<h2 id="6-RESTFul-CRUD"><a href="#6-RESTFul-CRUD" class="headerlink" title="6. RESTFul CRUD"></a>6. RESTFul CRUD</h2><p>CRUD 满足 Rest 风格</p>
<p>URI：  /资源名称/资源标识  （HTTP请求方式区分对资源CRUD操作）</p>
<table>
<thead>
<tr>
<th></th>
<th>普通CRUD（uri来区分操作）</th>
<th>RestfulCRUD</th>
</tr>
</thead>
<tbody><tr>
<td>查询</td>
<td>getEmp</td>
<td>emp — GET</td>
</tr>
<tr>
<td>添加</td>
<td>addEmp?xxx</td>
<td>emp — POST</td>
</tr>
<tr>
<td>修改</td>
<td>updateEmp?id=xxx&amp;xxx=xx</td>
<td>emp/{id}—PUT</td>
</tr>
<tr>
<td>删除</td>
<td>deleteEmp?id=1</td>
<td>emp/{id}—DELETE</td>
</tr>
</tbody></table>
<p>⭐ 项目的请求架构：</p>
<table>
<thead>
<tr>
<th>实验功能</th>
<th>请求URI</th>
<th>请求方式</th>
</tr>
</thead>
<tbody><tr>
<td>查询所有员工</td>
<td>emps</td>
<td>GET</td>
</tr>
<tr>
<td>查询某个员工(来到修改页面)</td>
<td>emp/1</td>
<td>GET</td>
</tr>
<tr>
<td>来到添加页面</td>
<td>emp</td>
<td>GET</td>
</tr>
<tr>
<td>添加员工</td>
<td>emp</td>
<td>POST</td>
</tr>
<tr>
<td>来到修改页面（查出员工进行信息回显）</td>
<td>emp/1</td>
<td>GET</td>
</tr>
<tr>
<td>修改员工</td>
<td>emp</td>
<td>PUT</td>
</tr>
<tr>
<td>删除员工</td>
<td>emp/1</td>
<td>DELETE</td>
</tr>
</tbody></table>
<h2 id="7-CRUD-员工列表"><a href="#7-CRUD-员工列表" class="headerlink" title="7.  CRUD - 员工列表"></a>7.  CRUD - 员工列表</h2><p>展示员工信息</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200705213428.png"></p>
<p>点击员工管理后调用 <code>list </code>函数显示所有员工信息：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>nav-link active<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">th:</span>href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>@&#123;/emps&#125;<span class="token punctuation">"</span></span> <span class="token punctuation">></span></span>
    ...
    员工管理
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<p><code>EmployeeController</code>：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Controller</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">EmployeeController</span> <span class="token punctuation">&#123;</span>

    <span class="token annotation punctuation">@Autowired</span>
    <span class="token class-name">EmployeeDao</span> employeeDao<span class="token punctuation">;</span> <span class="token comment">// 因为没有数据库，所有数据库都定义在 Dao 层里面了</span>

    <span class="token annotation punctuation">@RequestMapping</span><span class="token punctuation">(</span><span class="token string">"/emps"</span><span class="token punctuation">)</span>
    <span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">list</span><span class="token punctuation">(</span><span class="token class-name">Model</span> model<span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Employee</span><span class="token punctuation">></span></span> employees <span class="token operator">=</span> employeeDao<span class="token punctuation">.</span><span class="token function">getAll</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        model<span class="token punctuation">.</span><span class="token function">addAttribute</span><span class="token punctuation">(</span><span class="token string">"emps"</span><span class="token punctuation">,</span>employees<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> <span class="token string">"emp/list"</span><span class="token punctuation">;</span> <span class="token comment">// 跳转员工信息显示界面</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>员工信息显示界面 <code>list.html</code>：</p>
<p>从 model 中循环获取员工数据</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>main</span> <span class="token attr-name">role</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>main<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>col-md-9 ml-sm-auto col-lg-10 pt-3 px-4<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>table-responsive<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>table</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>table table-striped table-sm<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>thead</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>tr</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>th</span><span class="token punctuation">></span></span>id<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>th</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>th</span><span class="token punctuation">></span></span>lastName<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>th</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>th</span><span class="token punctuation">></span></span>email<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>th</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>th</span><span class="token punctuation">></span></span>gender<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>th</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>th</span><span class="token punctuation">></span></span>department<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>th</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>th</span><span class="token punctuation">></span></span>birth<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>th</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>th</span><span class="token punctuation">></span></span>操作<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>th</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>tr</span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>thead</span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>tbody</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>tr</span> <span class="token attr-name"><span class="token namespace">th:</span>each</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>emp:$&#123;emps&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>td</span> <span class="token attr-name"><span class="token namespace">th:</span>text</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;emp.id&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>td</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>td</span><span class="token punctuation">></span></span>[[$&#123;emp.lastName&#125;]]<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>td</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>td</span> <span class="token attr-name"><span class="token namespace">th:</span>text</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;emp.getEmail()&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>td</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>td</span> <span class="token attr-name"><span class="token namespace">th:</span>text</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;emp.gender&#125;==0?<span class="token punctuation">'</span>女<span class="token punctuation">'</span>:<span class="token punctuation">'</span>男<span class="token punctuation">'</span><span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>td</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>td</span> <span class="token attr-name"><span class="token namespace">th:</span>text</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;emp.department.departmentName&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>td</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>td</span> <span class="token attr-name"><span class="token namespace">th:</span>text</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;#dates.format(emp.birth, <span class="token punctuation">'</span>yyyy-MM-dd HH:mm<span class="token punctuation">'</span>)&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>td</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>td</span><span class="token punctuation">></span></span>
                        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>btn btn-sm btn-primary<span class="token punctuation">"</span></span> <span class="token punctuation">></span></span>编辑<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">></span></span>
                        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>btn btn-sm btn-danger deleteBtn<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>删除<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">></span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>td</span><span class="token punctuation">></span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>tr</span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>tbody</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>table</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>main</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="8-CRUD-员工添加"><a href="#8-CRUD-员工添加" class="headerlink" title="8. CRUD - 员工添加"></a>8. CRUD - 员工添加</h2><p><strong>步骤</strong>：</p>
<ul>
<li>按钮提交</li>
<li>跳转到添加界面</li>
<li>添加员工成功</li>
<li>返回首页</li>
</ul>
<p><strong>按钮</strong>：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h2</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>btn btn-sm btn-success<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">th:</span>href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>@&#123;/emp&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>员工添加<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h2</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<p><strong>跳转到添加界面</strong>：(采用 RESTFul 风格)</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 跳转到员工添加界面</span>
<span class="token annotation punctuation">@GetMapping</span><span class="token punctuation">(</span><span class="token string">"/emp"</span><span class="token punctuation">)</span>
<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">toAddPage</span><span class="token punctuation">(</span><span class="token class-name">Model</span> model<span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
    <span class="token comment">// 查出所有部门信息</span>
    <span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Department</span><span class="token punctuation">></span></span> departments <span class="token operator">=</span> departmentDao<span class="token punctuation">.</span><span class="token function">getDepartment</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    model<span class="token punctuation">.</span><span class="token function">addAttribute</span><span class="token punctuation">(</span><span class="token string">"departments"</span><span class="token punctuation">,</span>departments<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 存入model 使得前端能够获取</span>
    <span class="token keyword">return</span> <span class="token string">"emp/add"</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p><strong>添加界面</strong> <code>add.html</code>：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>form</span> <span class="token attr-name"><span class="token namespace">th:</span>action</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>@&#123;/emp&#125;<span class="token punctuation">"</span></span> <span class="token attr-name">method</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>post<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> <span class="token comment">&lt;!--虽然和跳转到员工界面的controller是同一个url，但是请求方式不一样--></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-group<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span><span class="token punctuation">></span></span>LastName<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span>
        <span class="token comment">&lt;!--正确的 name 才能够将信息顺利地提交给后端--></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>lastName<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-control<span class="token punctuation">"</span></span> <span class="token attr-name">placeholder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>飞天小牛肉<span class="token punctuation">"</span></span> <span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-group<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span><span class="token punctuation">></span></span>Email<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>email<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>email<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-control<span class="token punctuation">"</span></span> <span class="token attr-name">placeholder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>xiaoniurou@qq.com<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-group<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span><span class="token punctuation">></span></span>Gender<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span><span class="token punctuation">/></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-check form-check-inline<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-check-input<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>radio<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>gender<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>1<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-check-label<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>男<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-check form-check-inline<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-check-input<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>radio<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>gender<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>0<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-check-label<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>女<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-group<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span><span class="token punctuation">></span></span>department<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span>
        <span class="token comment">&lt;!--text 是下拉框显示的文字，提交的是 value 即部门id--></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>select</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-control<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>department.id<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>option</span> <span class="token attr-name"><span class="token namespace">th:</span>each</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>dept:$&#123;departments&#125;<span class="token punctuation">"</span></span>
                    <span class="token attr-name"><span class="token namespace">th:</span>text</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;dept.departmentName&#125;<span class="token punctuation">"</span></span>
                    <span class="token attr-name"><span class="token namespace">th:</span>value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;dept.id&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>option</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>select</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-group<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span><span class="token punctuation">></span></span>Birth<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>birth<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-control<span class="token punctuation">"</span></span> <span class="token attr-name">placeholder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>2020/12/29<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>submit<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>btn btn-primary<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>添加<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>form</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<blockquote>
<p>form 表单中的 <code>action </code>路径虽然和跳转到员工界面的 controller（<code>toAddPage</code>）是同一个url，但是请求方式不一样（RESTFul 风格）</p>
</blockquote>
<p><strong>添加员工</strong>：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 添加员工</span>
<span class="token annotation punctuation">@PostMapping</span><span class="token punctuation">(</span><span class="token string">"/emp"</span><span class="token punctuation">)</span>
<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">addEmp</span><span class="token punctuation">(</span><span class="token class-name">Employee</span> employee<span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
    employeeDao<span class="token punctuation">.</span><span class="token function">save</span><span class="token punctuation">(</span>employee<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 添加员工信息</span>
    <span class="token keyword">return</span> <span class="token string">"redirect:/emps"</span><span class="token punctuation">;</span> <span class="token comment">// 跳转到首页</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>还要注意日期格式问题，SpingBoot 默认日期格式是<code> yyyy/MM/dd</code>，我们可在全局配置文件中将其修改成 <code>yyyy-MM-dd</code></p>
<pre class="line-numbers language-properties" data-language="properties"><code class="language-properties"><span class="token comment"># 日期格式化（默认是yyyy/MM/dd）</span>
<span class="token attr-name">spring.mvc.format.date</span><span class="token punctuation">=</span><span class="token attr-value">yyyy-MM-dd</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>

<p><strong>最终效果如下</strong>：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200707104649.png"></p>
<h2 id="9-CRUD-员工修改"><a href="#9-CRUD-员工修改" class="headerlink" title="9. CRUD - 员工修改"></a>9. CRUD - 员工修改</h2><p>OK，接下来进行员工的修改：(编辑按钮在 <code>list </code>界面)</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>btn btn-sm btn-primary<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">th:</span>href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>@&#123;<span class="token punctuation">'</span>/emp/<span class="token punctuation">'</span>+$&#123;emp.getId()&#125;&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>编辑<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<p>url 上传入员工 id，后台获取 id 对该员工进行操作</p>
<p>和员工添加一样，写两个方法一个跳转到员工修改界面，一个用来实现修改员工信息</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 跳转到修改员工界面</span>
<span class="token annotation punctuation">@GetMapping</span><span class="token punctuation">(</span><span class="token string">"/emp/&#123;id&#125;"</span><span class="token punctuation">)</span>
<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">toUpdateEmp</span><span class="token punctuation">(</span><span class="token annotation punctuation">@PathVariable</span><span class="token punctuation">(</span><span class="token string">"id"</span><span class="token punctuation">)</span> <span class="token class-name">Integer</span> id<span class="token punctuation">,</span><span class="token class-name">Model</span> model<span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
    <span class="token comment">//查出原来的数据</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Employee</span> employee <span class="token operator">=</span> employeeDao<span class="token punctuation">.</span><span class="token function">getEmployeeById</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>employee<span class="token punctuation">)</span><span class="token punctuation">;</span>
    model<span class="token punctuation">.</span><span class="token function">addAttribute</span><span class="token punctuation">(</span><span class="token string">"emp"</span><span class="token punctuation">,</span>employee<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//查询所有部门信息</span>
    <span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Department</span><span class="token punctuation">></span></span> departments<span class="token operator">=</span>departmentDao<span class="token punctuation">.</span><span class="token function">getDepartment</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    model<span class="token punctuation">.</span><span class="token function">addAttribute</span><span class="token punctuation">(</span><span class="token string">"departments"</span><span class="token punctuation">,</span>departments<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token string">"emp/update"</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>

<span class="token comment">// 修改员工</span>
<span class="token annotation punctuation">@PutMapping</span><span class="token punctuation">(</span><span class="token string">"/updateEmp"</span><span class="token punctuation">)</span>
<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">updateEmp</span><span class="token punctuation">(</span><span class="token class-name">Employee</span> employee<span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
    employeeDao<span class="token punctuation">.</span><span class="token function">save</span><span class="token punctuation">(</span>employee<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 保存员工信息</span>
    <span class="token keyword">return</span> <span class="token string">"redirect:/emps"</span><span class="token punctuation">;</span> <span class="token comment">// 跳转到首页</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>修改界面 <code>update.html</code></p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>form</span> <span class="token attr-name"><span class="token namespace">th:</span>action</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>@&#123;/updateEmp&#125;<span class="token punctuation">"</span></span> <span class="token attr-name">method</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>post<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token comment">&lt;!--隐藏域，标名我们提交的id--></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>hidden<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">th:</span>value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;emp.getId()&#125;<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>id<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-group<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span><span class="token punctuation">></span></span>LastName<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name"><span class="token namespace">th:</span>value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;emp.getLastName()&#125;<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>lastName<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-control<span class="token punctuation">"</span></span> <span class="token attr-name">placeholder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>yanhang<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-group<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span><span class="token punctuation">></span></span>Email<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name"><span class="token namespace">th:</span>value</span> <span class="token attr-value"><span class="token punctuation attr-equals">=</span> <span class="token punctuation">"</span>$&#123;emp.getEmail()&#125;<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>email<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>email<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-control<span class="token punctuation">"</span></span> <span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-group<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span><span class="token punctuation">></span></span>Gender<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>br</span><span class="token punctuation">/></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-check form-check-inline<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name"><span class="token namespace">th:</span>checked</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;emp.getGender()==1&#125;<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-check-input<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>radio<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>gender<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>1<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span>  <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-check-label<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>男<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-check form-check-inline<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name"><span class="token namespace">th:</span>checked</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;emp.getGender()==0&#125;<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-check-input<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>radio<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>gender<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>0<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-check-label<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>女<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-group<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span><span class="token punctuation">></span></span>department<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span>
        <span class="token comment">&lt;!--text 是下拉框显示的文字，提交的是 value 即部门id--></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>select</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-control<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>department.id<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>option</span> <span class="token attr-name"><span class="token namespace">th:</span>selected</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;dept.getId() == emp.getDepartment().getId()&#125;<span class="token punctuation">"</span></span>
                    <span class="token attr-name"><span class="token namespace">th:</span>each</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>dept:$&#123;departments&#125;<span class="token punctuation">"</span></span>
                    <span class="token attr-name"><span class="token namespace">th:</span>text</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;dept.departmentName&#125;<span class="token punctuation">"</span></span>
                    <span class="token attr-name"><span class="token namespace">th:</span>value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>$&#123;dept.id&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>option</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>select</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-group<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>label</span><span class="token punctuation">></span></span>Birth<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>label</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name"><span class="token namespace">th:</span>value</span> <span class="token attr-value"><span class="token punctuation attr-equals">=</span> <span class="token punctuation">"</span>$&#123;#dates.format(emp.getBirth(),<span class="token punctuation">'</span>yyyy-MM-dd<span class="token punctuation">'</span>)&#125;<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>birth<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>form-control<span class="token punctuation">"</span></span> <span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>submit<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>btn btn-primary<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>添加<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>form</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="10-CRUD-员工删除"><a href="#10-CRUD-员工删除" class="headerlink" title="10. CRUD - 员工删除"></a>10. CRUD - 员工删除</h2><pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>btn btn-sm btn-danger<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">th:</span>href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>@&#123;<span class="token punctuation">'</span>/delemp/<span class="token punctuation">'</span>+$&#123;emp.getId()&#125;&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>删除<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 删除员工</span>
<span class="token annotation punctuation">@GetMapping</span><span class="token punctuation">(</span><span class="token string">"/delemp/&#123;id&#125;"</span><span class="token punctuation">)</span>
<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">toDeleteEmp</span><span class="token punctuation">(</span><span class="token annotation punctuation">@PathVariable</span><span class="token punctuation">(</span><span class="token string">"id"</span><span class="token punctuation">)</span><span class="token class-name">Integer</span> id<span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
    employeeDao<span class="token punctuation">.</span><span class="token function">delete</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token string">"redirect:/emps"</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="11-BUG-提醒"><a href="#11-BUG-提醒" class="headerlink" title="11. BUG 提醒"></a>11. BUG 提醒</h2><p>兄弟萌，在创建员工信息的时候，一定要注意Map 的 key 要和后面的 Employee 对象的 id 一致，否则没办法通过 <code>getEmployeeById </code>查询到对应的员工信息。如下是错误的示范：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200707142639.png"></p>
<p>✅ 下面是正确的：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200707142252.png"></p>
<h2 id="12-登出"><a href="#12-登出" class="headerlink" title="12. 登出"></a>12. 登出</h2><pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>nav-link<span class="token punctuation">"</span></span> <span class="token attr-name"><span class="token namespace">th:</span>href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>@&#123;/user/logout&#125;<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>退出<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 登出</span>
<span class="token annotation punctuation">@RequestMapping</span><span class="token punctuation">(</span><span class="token string">"/user/logout"</span><span class="token punctuation">)</span>
<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token class-name">UserLogout</span><span class="token punctuation">(</span><span class="token class-name">HttpSession</span> session<span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
    session<span class="token punctuation">.</span><span class="token function">invalidate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token string">"redirect:/index.html"</span><span class="token punctuation">;</span> <span class="token comment">// 重定向到首页</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<blockquote>
<p>完结撒花~ 🎉</p>
</blockquote>
<h2 id="📚-References"><a href="#📚-References" class="headerlink" title="📚 References"></a>📚 References</h2><ul>
<li><a target="_blank" rel="noopener" href="https://www.bilibili.com/video/BV1PE411i7CV?p=26">【狂神说Java】SpringBoot 最新教程IDEA版通俗易懂</a></li>
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